(Sorry for replying to your root comment, your reply isn't showing on my instance)
Ideally what I’d love is if posts worked like communities. For example you can navigate to https://lemmy.world/c/lemmy_support@lemmy.ml and you’ll be taken to the community page on Lemmy.world. But if we could link to something like https://lemmy.world/p/1543053@lemmy.ml and land on a particular post, that would make having to do a lookup completely pointless.
There is some good and some bad news for this. They are aware of this problem, and are having discussions to change it. But I don't know when it is coming. And I agree that a lookup would be useless if we can simply create the url directly.
If your instance is running version 0.18 you can type /c/asklemmy@lemmy.ml to link to this sub.
So
/c/community@instance
.